用FreeImage在图片中添加简单注释

最新推荐文章于 2020-11-21 06:59:47 发布

GeistYp

最新推荐文章于 2020-11-21 06:59:47 发布

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分类专栏：工具 Openframeworks 文章标签： FreeImage

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// Read File
　　FIBITMAP * bmp = NULL;
　　FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;

　　fif = FreeImage_GetFileType(fileName.c_str(), 0);
　　if(fif == FIF_UNKNOWN) {
    　　// or guess via filename
　    　fif = FreeImage_GetFIFFromFilename(fileName.c_str());
　　}

　　if((fif != FIF_UNKNOWN) && FreeImage_FIFSupportsReading(fif)) {
    bmp = FreeImage_Load(fif, fileName.c_str(), 0);

    if (bmp != NULL){
        bLoaded = true;
    }
}

// Write
	{
		FITAG* tag = FreeImage_CreateTag();

		string s = "Add Comment To Image";

		// property settings
		FreeImage_SetTagLength(tag, s.size());
		FreeImage_SetTagCount(tag, s.size());
		FreeImage_SetTagType(tag, FIDT_ASCII);
		FreeImage_SetTagValue(tag, s.c_str());

		// store the tag as a comment
		// use "Comment" only
		// if gif use "CommentX" x = 0-N
		FreeImage_SetTagKey(tag, "Comment"); 
		FreeImage_SetMetadata(FIMD_COMMENTS, bmp, FreeImage_GetTagKey(tag), tag);

		// destroy the tag
		FreeImage_DeleteTag(tag);

		// save and update file
		FreeImage_Save(fif, bmp, fileName.c_str(), JPEG_QUALITYGOOD);
		FreeImage_Unload(bmp);
	}

// Read
	{
		FITAG *tag = NULL;
		FIMETADATA *mdhandle = NULL;

		// get the 'Comments' metadata
		mdhandle = FreeImage_FindFirstMetadata(FIMD_COMMENTS, bmp, &tag);

		if(mdhandle) {
			char* c = (char*)FreeImage_GetTagValue(tag);
			cout<<c<<endl;

			FreeImage_FindCloseMetadata(mdhandle);
		}


	}